package com.example.cart.interceptor;

import cn.hutool.core.collection.CollectionUtil;
import cn.hutool.core.collection.ListUtil;
import cn.hutool.core.util.ObjectUtil;
import com.example.cart.to.UserInfoTo;
import com.example.common.constant.AuthServerConstant;
import com.example.common.constant.CartConstant;
import com.example.common.vo.MemberResponseVo;
import com.zaxxer.hikari.util.FastList;
import org.apache.commons.lang.StringUtils;
import org.springframework.stereotype.Component;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.util.UUID;

public class CartInterceptor implements HandlerInterceptor {

    public static ThreadLocal<UserInfoTo> threadLocal = new ThreadLocal<>();


    /**
     * 目标方法执行前
     *
     * @param request
     * @param response
     * @param handler
     * @return
     * @throws Exception
     */
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        UserInfoTo userInfoTo = new UserInfoTo();
        HttpSession session = request.getSession();
        MemberResponseVo member = (MemberResponseVo) session.getAttribute(AuthServerConstant.LOGIN_USER);
        if (ObjectUtil.isNotEmpty(member)) {
            userInfoTo.setUserId(member.getId());
        } else {
            Cookie[] cookies = request.getCookies();
            if (cookies != null && cookies.length > 0) {
                for (Cookie cookie : cookies) {
                    if (cookie.getName().equals(CartConstant.TEMP_USER_COOKIE_NAME)) {
                        userInfoTo.setUserKey(cookie.getValue());
                    }
                }
            }
        }
        //如果没有临时用户，一定要分配一个临时用户
        if (StringUtils.isEmpty(userInfoTo.getUserKey())) {
            userInfoTo.setUserKey(UUID.randomUUID().toString());
        }
        //目标方法执行之前，把消息放进threadlocal
        threadLocal.set(userInfoTo);
        return true;
    }

    /**
     * 业务执行之后，保存cookie
     *
     * @param request
     * @param response
     * @param handler
     * @param modelAndView
     * @throws Exception
     */
    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        UserInfoTo userInfoTo = threadLocal.get();
        if (userInfoTo.getTempUser()) {
            Cookie cookie = new Cookie(CartConstant.TEMP_USER_COOKIE_NAME, userInfoTo.getUserKey());
            cookie.setDomain(".gulimall.com");
            cookie.setMaxAge(CartConstant.TEMP_USER_COOKIE_TIMEOUT);
            response.addCookie(cookie);
        }
    }
}
